/Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/Selections/GeometrySelectionUtil.h
Assuming that the uint64 values in the GeometrySelection are encodedFGeoSelectionID's, find the item that has a matching TopologyID, ignoring the GeometryID.
true if an item was found
namespace UE { namespace Geometry { bool UE::Geometry::FindInSelectionByTopologyID ( const [FGeometrySelection](API\Plugins\DynamicMesh\Selections\FGeometrySelection) & GeometrySelection, uint32 TopologyID, uint64 & FoundValue ) } }